Smarag, Devourer of Mages

Flying, ward {2}

Whenever an artificer, cleric, druid, shaman, warlock, wizard or planeswalker would die, exile it instead. Then
put two +1/+1 counters on Smarag.

Counters remain on Smarag as it moves to any zone other than a player’s hand or library.

Remove a counter from Smarag: The next instant or sorcery spell you cast this turn costs {1} less to cast.